Regarding object reference

[amitabhcy]

Hello to members,

I am getting fatal error while running the following code. Any solutions to avoid the error.
The error is
PHP Fatal error: Call to a member function getD() on a non-object in ..... on line 24.

The objective is to call the getValue() function of of D type object. Your guidance is required. I am using PHP5+ and Apache 2.2 on windows XP.

The code is below:

 
<?php
class Z{
    function Z(){
 
    }
}
class A extends Z{
    function A(){
        parent::Z();
    }
 
    function &getB(){
        $b = new B();
        return $b;
    }
}
 
class B{
    private $c;
    public function B(){
        $this->c = new C();
    }
 
    public function &getD(){
        return $this->c->getD();
    }
 
    public function &getE(){
        return $this->c->getE();
    }
}
 
class C{
    private $f;
    public function C(){
        $this->f = array();
    }
 
    private function setD(){
        $this->f[0][0] = new D();
    }
 
    private function setE(){
        $this->f[0][1] = new E();
    }
 
    public function &getD(){
        return $this->f[0][0];
    }
 
    public function &getE(){
        return $this->f[0][1];
    }
}
 
class D{
 
    public function D(){
    }
 
    public function getValue(){
        return "Val";
    }
}
 
class E{
    public function E(){
    }
 
    public function getValue(){
        return "Eval";
    }
 
}
 
$a = new A();
$b =& $a->getB();
$d = $b->getD();
echo $d->getValue()
?>
 

regards,

[amitabhcy]

Hello again

The code provided is a simulation of a project I am working on. The object structure is the same as in the case of the project.

Kindly look into the code and inform how to correct.

regards,

[code green]

This is very complex.
Is the error occuring in this class?
[PHP]class B{
private $c;
public function B(){
$this->c = new C();
}

public function &getD(){
return $this->c->getD();
}

public function &getE(){
return $this->c->getE();
}
}[/PHP] I don't think the C class has had a D object instantiated, so this line is illegal [PHP]return $this->c->getD();[/PHP] Well it has but within an array[PHP]private function setD(){
$this->f[0][0] = new D();[/PHP] So C can reference an array of D objects but you have not specified which of them in the B class.
Well that is my guess. this really is complex.

[amitabhcy]

Is the error occuring in this class?

The error occurs in the line number 79 of the original post. The objects are getting created. This is verified with the print_r function.

It seems some where a reference should have been placed. Dunno where.

regards